QUALITY OF WATER SOURCE
Scientists has discovered various sources of water among whom were Rain,Tap, River, groundwater etc. All rainwater contains constitutions that are take up or washed out from the atmosphere. Atmospheric gases are dissolved in the rainfall droplets. Above oceans and seas, salts are taken up from the fine spray over the Water surface. Over land areas particularly in any regions, dust particles are washed out.
Rainwater is usually slightly acidic due to its reaction with carbon dioxide in the atmosphere to form carbonic acid. When rainwater contacts gaseous pollutants in the atmosphere like sulphur dioxide (e.g. from volcanoes, industry), it may become quite acidic causing problems of corrosion and bitterness of taste. In rural areas, however, this is not a common problem.
After reaching the ground surface, rainwater forms surface runoff or groundwater flow. It will pick up considerable amounts of mineral compound and of organic, soil particles and micro-organisms. Fertilizers and pesticides may be picked up in areas where they are used in agriculture. While flowing underground, the water will' leach out constituents from the ground strata, in particular carbonates, sulphates, chlorides, calcium, magnesium and sodium salts. Thus, the total dissolved solids content of the water is increased. At the same time, filtration takes place removing suspended solids. Some organic substances are biologically degraded. Adsorption and other processes may result in the removal of bacteria, and of suspended and dissolved solids
